Sometimes if I launch a game on my crunch box while seti is running, the graphic card blanks-n-tanks, I get a message the driver has recovered, and the current CUDA WU terminates with a "Computational Error."

All that is fine. What isn't fine is from then on out, at least until I reboot, CUDA jobs that used to run in 20 minutes will now run slow-mo taking over 2 hours.

Has anyone seen this and do you know of any process other than rebooting the box to get the nvidia card to re-initialize properly? Full exit of boinc & services does not resolve, this is burried someplace. I've tried the obvious things inside the nvidia applet (and EVGA Precision) and windows proper.

You didn't say what Boinc version you're running, but i suspect it's 6.10.14,
as i've had 'NVIDIA GPU has become unusable; disabling tasks' as well,
mine was on Collatz Conjecture with a bit of IE Browsing and downloading,
But went away when i upgraded to 6.10.15, changes are:

Rom 19 October 2009
- client: Use is_remote_desktop() instead of the various GPU functions to determine when the client software has been switched into Remote Desktop mode and shutsdown GPU apps. This will prevent App crashes

One other item I stumbled on last night trying to solve this, I'm using a Gigabyte (P55-UD2) motherboard, and it comes with their own clocking util (EasyTune6) to ease configuration of the Award Bios settings. Although not all settings are part of BIOS, it has a TAB called "Graphics," and sure enough the values it showed were the slow ones that only appear after a GPU crash & recover. Although I could not set the values to the OC levels, I *COULD* up the values to the original out-of-the-box levels. So GPU WU's instead of taking 20 minutes will take 22 minutes after a crash (which is much better than 2 hours).

Classic, those non-Bios settings don't survive a reboot (but do of course survive a GPU crash & driver recover), but I might be able to auto-load a profile file, I'll worry about it later. But thought I'd share this info now, as here were a set of settings that really don't belong where they were, and somehow inserted themselves AHEAD of everything nVidia ships (albeit, only in the scenario of a GPU crash).

You didn't say what Boinc version you're running, but i suspect it's 6.10.14,
as i've had 'NVIDIA GPU has become unusable; disabling tasks' as well,
mine was on Collatz Conjecture with a bit of IE Browsing and downloading,
But went away when i upgraded to 6.10.15, changes are:

Rom 19 October 2009
- client: Use is_remote_desktop() instead of the various GPU functions to determine when the client software has been switched into Remote Desktop mode and shutsdown GPU apps. This will prevent App crashes

Claggy

Looks like I'll have to upgrade. I had the exact same crash (trashed 3 GPUGrid units) yesterday while gaming. Currently using 6.6.36
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I've upgraded. I was gaming with BOINC completely shut down. Still had the video driver crash.Display driver nvlddmkm stopped responding and has successfully recovered. (Event ID 4101)
This has happened with the current drivers and latest previous drivers. I never suffered a video crash with SETI CUDA. The problems started a few days into GPU Grid (was gaming and crunching Grid at the same time.) So I'm wondering if a file somewhere has been corrupted.
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It's happened to me before, the GPU clocks go from 550/1375/900 MHz (core/shaders/memory) to 383/767/301 MHz and stay there, which is why WUs take considerably longer. Unfortunately, the only solution I know of is to restart. The drivers do this when the card gets too hot and/or you overclock too far.

You can use GPU-Z to check whether the clocks go down (under the Sensors tab).
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